Hearing a ringing, buzzing, hissing, or other unusual sound in your ears isn’t uncommon. It can happen temporarily after listening to loud music, attending a concert, or being exposed to sudden noise. Usually, the sensation fades. But what if the strange sound keeps returning—or doesn’t disappear at all?

Persistent noises can sometimes be a form of tinnitus, and one particular type sounds quite different from the ringing most people associate with the condition. Known as pulsatile tinnitus, it may produce a rhythmic whooshing, thumping, or pulsing sensation that seems to match your heartbeat. Some people notice it more during exercise, when their heart beats faster, and less when their heart rate settles. While pulsatile tinnitus doesn’t automatically mean something serious is happening, there is an important reason why a new or persistent heartbeat-like sound deserves medical attention. Continue below to learn what could be behind it.